linux-kernel - [PATCH v1] ARM: imx: mach-imx6q: correctly identify i.MX6QP SoCs

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Date:   Wed,  4 Nov 2020 11:54:18 -0500
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>
Cc:     Russell King <linux@...linux.org.uk>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Anson Huang <Anson.Huang@....com>, Peng Fan <peng.fan@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] ARM: imx: mach-imx6q: correctly identify i.MX6QP SoCs

The i.MX6QP rev 1.1 SoC on my board is mis-identified by Linux:
the log (incorrectly) shows "i.MX6Q rev 2.1".

Correct this by assuming that every SoC that identifies as
i.MX6Q with rev >= 2.0 is really an i.MX6QP.

Signed-off-by: Sven Van Asbroeck <TheSven73@...il.com>
---

Tree: v5.10-rc2

To: Shawn Guo <shawnguo@...nel.org>
Cc: Russell King <linux@...linux.org.uk>
To: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>
Cc: Fabio Estevam <festevam@...il.com>
Cc: NXP Linux Team <linux-imx@....com>
Cc: Anson Huang <Anson.Huang@....com>
Cc: Peng Fan <peng.fan@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org

 arch/arm/mach-imx/mach-imx6q.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index 85c084a716ab..703998ebb52e 100644
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -245,8 +245,13 @@ static void __init imx6q_axi_init(void)
 
 static void __init imx6q_init_machine(void)
 {
-	if (cpu_is_imx6q() && imx_get_soc_revision() == IMX_CHIP_REVISION_2_0)
-		imx_print_silicon_rev("i.MX6QP", IMX_CHIP_REVISION_1_0);
+	if (cpu_is_imx6q() && imx_get_soc_revision() >= IMX_CHIP_REVISION_2_0)
+		/*
+		 * SoCs that identify as i.MX6Q >= rev 2.0 are really i.MX6QP.
+		 * Quirk: i.MX6QP revision = i.MX6Q revision - (1, 0),
+		 * e.g. i.MX6QP rev 1.1 identifies as i.MX6Q rev 2.1.
+		 */
+		imx_print_silicon_rev("i.MX6QP", imx_get_soc_revision() - 0x10);
 	else
 		imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
 				imx_get_soc_revision());
-- 
2.17.1